(a) The cutter chains of mining machines shall be locked
securely by mechanical means or electrical interlocks while such
machines are parked or being trammed. Loading machines shall not
be trammed with loading arms in motion, except when loading
materials.

(b) Belt, chain or rope drives and the moving parts of
machinery which are within seven feet of the floor, ground or
platform level, unless isolated, shall be guarded adequately.
Repair pits shall be kept covered or guarded at all times when not
in use. Machinery shall not be lubricated or repaired while in
motion, except where safe remote lubricating devices are used.
Machinery shall not be started until the person lubricating or
repairing it has given a clear signal. Guards which have been
removed shall be replaced before the machinery is again put into
use. Provision shall be made to prevent accumulations of spilled
lubricants.

(f) All battery powered equipment shall be equipped with
under-voltage indicator which will indicate when the voltage is
less than three-fourths of its rated capacity, at which time such
equipment shall be be withdrawn from use except for the purpose of
returning the vehicle to the recharging station.

(g) On and after the first day of January, one thousand nine
hundred eighty-eight, all manually operated valves and levers of
equipment of the same manufacturer and model shall have the same
direction of activation and direction of operations.